--- a/mercurial/store.py	Sun Oct 06 19:25:18 2019 -0400
+++ b/mercurial/store.py	Mon Oct 07 00:04:04 2019 -0400
@@ -144,7 +144,7 @@
         cmap[xchr(x)] = e + xchr(x).lower()
 
     dmap = {}
-    for k, v in cmap.iteritems():
+    for k, v in pycompat.iteritems(cmap):
         dmap[v] = k
 
     def decode(s):